AD9267,pdf datasheet (Dual Con

The AD9267 is a dual continuous time (CT) sigma-delta (Σ-Δ)
modulator with −88 dBc of dynamic range over 10 MHz real or 20 MHz complex bandwidth. The combination of high dynamic range, wide bandwidth, and characteristics unique to the continuous time Σ-Δ modulator architecture makes the AD9267 an ideal solution for wireless communication systems. The AD9267 has a resistive input impedance that significantly
relaxes the requirements of the driver amplifier. In addition, a
32× oversampled fifth-order continuous time loop filter attenuates out-of-band signals and aliases, reducing the need for external filters at the input. The low noise figure of 15 dB relaxes the
linearity requirements of the front-end signal chain components, and the high dynamic range reduces the need for an automatic gain control (AGC) loop.